I got some reviews, but it was visibility that I got. For example, I found mobileread based on someone's post that they had received my book for free. There were other connections like that as well. I posted in a few forums and some folks picked it up and read. I've gotten a number of good reviews fairly quickly - couldn't tell you why. A couple are from bloggers, but most told me it would be awhile before they got to it. I think there's some luck in this too.